If I change the title of a post to target a similar keyword wil I lose the work I put in?

The main reason I ask is cos I am getting more hits for the other one than the one I was specifically targeting so thought it might be better to focus on rnaking that one instead and having the initial one as an incidental.

I have a keyword I was working on, say, 'fast green cars' and then I later noticed in analytics that I was getting hits for 'fast cars'. I checked with adwords and found out that fast cars has nearly twice the exact searches. They are both only small long tailers which is why they weren't on my radar (the 1st one I picked specifically as the lowest traffic one of my list to practice with) but I'm wondering how to get most juice out of them.

I'm on front page for each keyword (with the same article) as it is I was just wondering if changing the title would be advantageous or not to target the one which gets more hits- or would it be detrimental in terms of messing up the work I'd already done?

And/or I am gonna just start using 'fast cars' for a while when blasting the article so focus more on ranking that one than 'fast green cars' as I was before.

From personal experience, leave it as it is. I've found that when you try to change or refine targetting with the current algorithms in place, you have more to lose than you have to gain. When your rankings tank, take another look but Google is now using delay tactics in ranking pages.

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